Correct way to handle transient files in /var

What is the correct way to handle files in /var which can be
removed when a package is uninstalled?
for example policykit seems to require:
root:polkit /var/lib/PolicyKit
polkit:wheel /var/lib/PolicyKit-public
polkit:polkit /var/lib/misc/PolicyKit.reload
Without these it chokes when hal tries to use it (and hald
will not run).
On uninstall it would probably be reasonable to remove them.
So, just handcode in INSTALL and DEINSTALL?